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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fd9f91c27c5aba47d6c17e97744183dffdf25845659958c6d705ed27859f7e1' 
  AND token = 'RsjQ2ZF4RWB1sB/LwIwekYuVE9h6mABjmyV1adXoSWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}